Manufacturer of fans and shutters for 98 years. Unique static shaft design for wall and power roof ventilators with L10 life of over 300,000 hours. We manufacture fans from 6 inch to 7 feet in diameter and up to 118,000 cfm. We make tube axial, vane axial, up-blast and supply PRVs. Inline. up-blast, down blast, and wall centrifugal centrifugal fans. High temperature fans and many fans have UL705, 762, and 793 certifications.